 //**********************************************
 // light.java        Author:20172323wyh
 //**********************************************
 public class light
 {
    public static void main(String[] args)
    {  
       Bulb a;
       a = new Bulb();
       
       System.out.println("The inisite state: " + a);
       
       a.turnOn();
       System.out.println("change the state: " + a);
       
       a.turnOff();
       System.out.println("change the state again: " + a);
    }
 }
       
